nacos coredns plugin 修改代码简单说明

因为历史版本比较老以及兼容问题，调整支持coredns 新版本，以下简单说明下代码修改

支持go mod

因为构建是推荐基于了go mod，所以支持了go mod

go.mod

module github.com/rongfengliang/coredns-nacos

支持用户密码认证

主要是在配置解决以及client 中添加了密码认证的支持

• 解析部分

for c.Next() {
		nacosImpl.Zones = c.RemainingArgs()
		if c.NextBlock() {
			for {
				switch v := c.Val(); v {
				case "nacos_namespaceId":
					namespaceId = c.RemainingArgs()[0]
				case "nacos_server_host":
					serverHosts = strings.Split(c.RemainingArgs()[0], ",")
				case "nacos_username":
					userName = c.RemainingArgs()[0]
				case "nacos_password":
					password = c.RemainingArgs()[0]

• client

func NewNacosClient(namespaceId string, serverHosts []string, userName, password string) *NacosClient {
	fmt.Println("init nacos client.")
	initLog()
	vc := NacosClient{NewConcurrentMap(), UDPServer{}}
	vc.loadCache()
	vc.udpServer.vipClient = &vc
	//init grpcClient
	var err error
	GrpcClient, err = NewNacosGrpcClient(namespaceId, serverHosts, userName, password, &vc)
	if err != nil {
		NacosClientLogger.Error("init nacos-grpc-client failed.", err)
	}

	if EnableReceivePush {
		go vc.udpServer.StartServer()
	}

	AllDoms = AllDomsMap{}
	AllDoms.Data = make(map[string]bool)
	AllDoms.DLock = sync.RWMutex{}
	AllDoms.CacheSeconds = 20

	vc.getAllServiceNames()

	go vc.asyncGetAllServiceNames()

	//go vc.asyncUpdateDomain()

	NacosClientLogger.Info("cache-path: " + CachePath)
	return &vc
}

• grpc client

func NewNacosGrpcClient(namespaceId string, serverHosts []string, userName, password string, vc *NacosClient) (*NacosGrpcClient, error) {
	var nacosGrpcClient NacosGrpcClient
	nacosGrpcClient.nacosClient = vc
	if namespaceId == "public" {
		namespaceId = ""
	}
	nacosGrpcClient.namespaceId = namespaceId //When namespace is public, fill in the blank string here.

	serverConfigs := make([]constant.ServerConfig, len(serverHosts))
	for i, serverHost := range serverHosts {
		serverIp := strings.Split(serverHost, ":")[0]
		serverPort, err := strconv.Atoi(strings.Split(serverHost, ":")[1])
		if err != nil {
			NacosClientLogger.Error("nacos server host config error!", err)
		}
		serverConfigs[i] = *constant.NewServerConfig(
			serverIp,
			uint64(serverPort),
			constant.WithScheme("http"),
			constant.WithContextPath("/nacos"),
		)

	}
	nacosGrpcClient.serverConfigs = serverConfigs

	nacosGrpcClient.clientConfig = *constant.NewClientConfig(
		constant.WithNamespaceId(namespaceId),
		constant.WithTimeoutMs(5000),
		constant.WithNotLoadCacheAtStart(true),
		constant.WithUpdateCacheWhenEmpty(true),
		constant.WithUsername(userName),
		constant.WithPassword(password),
		constant.WithLogDir(LogPath),
		constant.WithCacheDir(CachePath),
		constant.WithLogLevel("debug"),
	)

	var err error
	nacosGrpcClient.grpcClient, err = clients.NewNamingClient(
		vo.NacosClientParam{
			ClientConfig:  &nacosGrpcClient.clientConfig,
			ServerConfigs: nacosGrpcClient.serverConfigs,
		},
	)
	if err != nil {
		fmt.Println("init nacos-client error")
	}
	nacosGrpcClient.SubscribeMap = AllDomsMap{}
	nacosGrpcClient.SubscribeMap.Data = make(map[string]bool)
	nacosGrpcClient.SubscribeMap.DLock = sync.RWMutex{}

	return &nacosGrpcClient, err
}

说明

注意corends plugin 的顺序是基于plugin.cfg 静态配置的，对于使用此plugin 推荐在kubernetes，等后续支持nacos 的goup 解析

参考资料

https://github.com/rongfengliang/coredns-nacos